Grinding-machine.



M. MOSLER & C. BARTELS.

GRINDING MACHINE APPLICATION men mvz. i915.

Patented Sept. 14, 1515.

2 SHEETS-SHEET 1.

1 I i) o o o g ii 0 N Moses Mas/er 0 Carl Barf/s W1tness; Inventars.

Attorney M. MOSLER & C. BARTELS.

GRINDING MACHINE.

APPLICATION FILED JULY 2. 1915.

Patented Sept. 14, 1915.

. Inventors 11 (W b 5 a2 Afitorney fitness UNITED STA E T N LQ E- MOSES MOSLER,

or CINCINNATI, AND CARL BARTELS, or HAMrLroN, onto, ASSIG-NORS To THE MOSLER earn COMPANY, on NEW YORK, N. Y.

GRINDING-MACHINE.

Patented Sept. 14, 1915.

, Application filed July 2, 1915. Serial No. 37,650.

To all whom it may concern:

Be it known that we, Moses MOSLER, .a citizen of the United States, residing at Cincinnati, Hamilton county, Ohio, and CARL BARTELS, a citizen of the United States, residing at Hamilton, Butler county,

' Ohio, have invented certain new and useful Improvements in Grinding-Machines, of which the following is a specification.

This invention, pertaining to improvements in grinding machines, relates particularly to improvementsin machines for grinding the doors and door-jambs of safes of the round door type. I The improvements will be readily understood from the following description taken in connection with the accompanying drawings in which Figure 1 is a plan of a grinding machine exemplifying our improvements, the machine being illustrated as operating upon the door-jamb of a safe illustrated in the plane of line (1 of Fig. 2: Fig. 2 a side ele- 'ation of the machine under the same conditions: Fig. 3 a side elevation of the shifting mechanism, the lathe-arbor appearing in vertical section in the plane of line a of Figs. 1 and-2: Fig. 1 a side elevation of the shifting-fork, parts appearing in vertical section in the plane of line b of Figs. 1 and 2: Fig. 5 a rear 'view of a portion of the shifting mechanism, a. part appearing in vertical section in the plane of line 6 of Fig. 3: and Fig. 6 a vertical longitudinal section of the pulley of the grinding-spindle, in the plane of line 7 of Fig. 1.

A diversity of scales is employed in the drawings. I

Our machine, generally considered, embodies'a bed; a fixed headstock thereon; an arbor journaled therein and carrying a chuck; a carriage mounted on the bed; and a spindle suppforted by the carriage and carrying the grinding wheel.

In the drawings :1,-'indicates the bed provided with guide-ways: 2, a headstock fixedly mounted on one end of the bed: 3, the outer headstock bearing for the arbor: 4, the inner headstock bearing for the arbor: 5, the arbor mounted for rotary and endwise movement in the headstock bearings:

(3, a chuck carried by the arbor and adapted to support the article with which the grinddeal, our present contemwith will be the body or door of a safe of round,door type,. the illustration showing the chuck as carrying a safe-body: 7, an.

internal gear fast with the chuck: 8, a fixed countershaft journaled in the headstock parallel with the arbor: 9, a'pinion carried by the first countershaft and engaging the internal gear of the chuck: 10, a second countershaft journaled in the headstock: 11, a pinion loose on the first countershaft: 12, a sleeve loose on the first countershaft and having the pinion 11 secured to it: 13, a gear,,.fast on the second countershaft and engaging pinion 11: 14:, a pinion fast on the second countershaft'f 15, a gear fast on the first countershaft and engaging pinion 14-1 16, a pulley loose I011 sleeve 12 and provided with a clutch-hubt 17, a second pulley loose on sleeve 12 and provided with a clutch-hub, the two clutch-hubs facing each other: 18, aclutch splined on sleeve 12 and adapted, when thrown one way or the other, tolock pulley 16 or pulley 17 to the sleeve and, consequently, to pinion 11: 19, a pivoted shifting lever provided with a fork engaging clutch 18 so that the lever may be oscillated to shift the clutch into engagement, selectively, with either of the two pulleys: 20, the pivot on which lever 19 oscillates, this pivot being supported by a portion of the headstock: 21, pins or rollers projecting downwardly from the inner end of clutch-lever 19, these pins orrollers being disposed in lever 19 at a considerable distance from each other in the line of the axis of the arbor, the end of the clutchlever which carries these rollers projecting inwardly to near the arbor: 22, an arm supported by a portion of the headstock and disposed below the clutch-lever and projecting inwardly between rollers 21 in such manner that the oscillation of arm 22 will cause the arm to engage one of the rollers 21, the particular one being dependent upon the direction of move-- ment of the. arm: 23, the pivot on which arm 22 oscillates, this pivot being fixedly supported by a portion of the headstock: 24, a pair of side acting collars or cams carried by arbor 5 and adapted to be longitudinally adjusted thereon, these two cams'being in such position as to straddle the vertical plane of the inner end of arm 22: 25, a pin or roller projecting outwardly from the end of arm 22 and adapted to be engaged by the by the headstock and surrounding the outer end of thearbor: and 27 a threaded leader secured to the arbor and engaging nut so thatasthe arbor turns it will be mo endwise relative to the headstock- I The design is that theohuck, with- 0 work carried by it, will-turn in one direction, through one or more rotations, travel-1 ing endwise during its turning, and thatthe motions of the chuck shall then be reversed I as to rotation and endlwise movement, and

of the slider.

so on and on. In case a thread of a given "pitch is to be ground upon the work then the thread of leader 27 is to have the same pitch, and provisions are to be made for the substitution of leaders in case a variety of" threads are to be produced in the machine. Nut 26 maybe a: complete nut to fit the leader but it is our-preference that only the upper half of the nut be a real nut with threads in it, the lower half bein merely a bearin for the outer portion. of t 1e threads One of pulleys 16 is-to be driven by open belt and the other by cross belt. Assuming clutch 18' to be in neutral I pulleys will turnidly on arbor and chuck will be at rest.

\ which is fast with the iendwise; by reason o osition the two eeve 12 and the If, now, by manipulating clutch-lever l9 clutch 18 be thrown into engagement with one of the pulleys, that pulley will become locked tothe sleeve 12 and conse uently, to pinion 1 s e'eve. The result i. that the gearing will cause: rotary motion tobe transmitted to the chuck in a certain direction. The arbor in rotating," moves {leader 27 working through nut 28. 3: v

When the endwise movement of the arbor has proceeded a certain distance, for which .the collars 24: have been adjustechone of the v collars will engage'roller 25 of arm-22 and v endwise movement.

shift that arm sidewise and bring about a sidewise shifting of clutch-arm 19 and cause the clutch 'to leave the pulley with which {it I is engagedandto engage with, thezbpposite pulley whereupon the arbor aan'd ,ohuck turn in the opposite directionofrotationand' The chuck, together with the work carried by it, therefore will. obviously. moverotarily and longitudinally first in one direction and then the other, the

times between the reversal of motion being dependent-upon the adjustment of. collars 24a1ongthearbor; ,v For the character-"of work Practically dealt with by. us, the'grindingo the doors 'and door-jambs'of safes, we prefer that the reversal of the direction of motions be effect. ed at the end of 'eachone and-one quajrter rotation ofthe chuck an excess over one der that the grinding wheel shall lap over' 'its work and not pro. duce a seam in its work- Y Collarfif-2 could bring about the desired l of} motions if they had no cam qu liti b1 'itis our desire that these collars he faces to engage pin 25 as it thus possible to rovide for reversals of lnotion not depen ent entirely upon the divise movement of the arbor. In other cam faces, as illustrated, the shifting of arm may-be controlled,,at proper points, by the rotation of the collars as well as by their endwise motion. The spiral cams of the collars'also. permit ofa more delicate adjustmentfor the shifting instant than would be possible if-the endwise motions only of the collars were depended upon.

It is well known that motion-reversin devices of the character thus far described, are open to the objection of stopping at the neutral point and thus not completing the reversal. We overcome this by 'the not unusual scheme illustrated in. Fig. 5 in which 51'is a wedge-shaped spring plunger engaga corresponding wedge on arm 22. W ile arm 22 is being urged. tooneside by one'of the collars on the arbor, the wedge 51,

. lint such times as the machine is at rest,

ad in placing, adjusting, or in moving the w rk, it is of high importance that the cl tch cannot be so shifted as to. start up tl machine. We will now describe the construction looking to this end. 1'

Proceeding with the drawings: 28, indi-- cates an aperture through clutch-lever 19 normally concentric with fixed pivot 23 of arm 22, the upper end of pivot, 23fbearing fixedly a bearingfor an eccentric mechapassesthe apex of by providing'the collars with spiral nism: 29, a detent collar sliding vertically on pivot 23'and adapted to enter aperture 38;.30, an eccentric mechanism consisting of a shaft journaled in the upper portion of pivot 23, a leverson that shaft,iand outwardly extendin eccentric pins engaging slots in cars onco. ar 29: 31, a link pro]ectingfrom thearm of the eccentric mechanism: an'dn82, a hand-lever connected with link 31 and adapted to hold theeccentric mechanism in active or idle position.

.Normallydetent collar 29 will 'be in the position indicated in Fig.4, and out of oilice, and clutch-lever 19 will be free for the performance of its oliice. If, now, hand-.

lever 32 be properly moved while the clutchlevcr is in neutral position, or moving past the neutral position, detent collar 2 will be moved down into aperture 28and while the defeat collar remains in this position the (hitch-level is locked in neutral position. The hand-lever is preferably provided with means for looking it in either the active or idle position.

We will now describe the mechanism directly associated with the grinding wheel.

Proceeding with the drawings: 33 indicates a carriage sliding on the ways of the bed:

34, a slide adapted for cross movement on the carriage, this'slide bearing a vertically open cylinder which is vertically slit and provided with a clamp: 34, a compound rest swiveled' for angular adjustment in slide3i: a housing longitudinally adjustable on the compound rest: 35, a screw for adjusting housing 35 on the compound rest: 36, ears projecting upwardly from housing 35: 37, a wheel-housing trunnioned in ears 36: 38, a wheel spindle journaled in the wheel housing: 39, an adjusting device for regulating and securing the adjustment of the wheel housing relative to housing 35: 40, a grinding wheel carried by the inner end of wheel spindle 38 and adapted for the performance of such grinding work as the machine may be called upon to perform: 41, a pair of ears carried by housing 35: 42, a pulley having exteriorly projecting journals running in ears 41: 4:3, shallow longitudinal grooves in wheel spindle 38 and at about the longitudinal center of pulley 42: 44,v screws disposed radially in pulley 41 and having concavities at their inner ends: 45, a ball disposed in the concavity of each screw 44 and engaging a corresponding groove *3 in wheel spindle 38: 46, mechanism mounted on the carriage 43 and adapted for the adjustment of the carriage to and from the chuck, this mechanism being not necessarily unlike the shifting mechanism usually provided on lathe carriages: 17,- a binder to secure the lathe carriage to the bed of the machine in adjusted position, if such securing shall be needed: 4:8, a shaft journaled across the carriage and provided with a hand-wheel for turning it: 49, a screw mounted in the carriage and adapted for moving slide 34 across the carriage, after the usual manner of ordinary engine lathes: 50, gearing, of an obvious character, connecting shaft 4:8 with screw 49: and 51, the neutralizing wedge device heretofore referred to.

The principal purpose of our machine is the grinding of screw threads on safe doors and in the door-jambs of safes, and especially on safes and doors of such peculiarly resisting metal as manganese steel. Our machine is, however, adaptedv for the grinding of short cylindrical surfaces, either interior or exterior. The chuck which we illustrate is acter and is to be considered as merely examplifying.

, varying thickness that,

of an obvious char- If a short cylindrical terior or exterior is to be ground, then wheel housing 37 is to be so adjusted and secured that the axisof the wheelspindle will be parallel with the axis of the arbor. It may be well to here state that our preference is that the adjusting device 39 for the horizontal angle of the wheel spindle be of a solid character not within itself adjustable. Instead of an adjusting screw arrangement we prefer the employment of selective blocks of definite height to be interposed between housing and housing 37, the blocks being of such when clamped between the two housings, the wheel spindle willbe eithe'r horizontal or at such angleas will bring the grinding wheel tangent to the angle of the thread to be ound.

ontinuing the assumption that it be desired to grind it short cylindrical surface,-

surface,.- either inshould be the one which will cause the work to move axially toward the wheel. The rotary and endwise motion of the work proceeds until a collar on the arbor brings about the shifting of the clutch whereupon the work turns and moves axially in the opposiie direction, and so on and on until the work is completed, it being understood, of course, that during this operation the slide will be adjusted at suitable intervals so as to keep the wheel in proper action upon the work. In this operation the axial movement has been made by the work and not by the wheel. i

In grinding operations of the character for which our machine is designed, there is no such end thrust as is incident to, the operation of ordinary cutting tools, and we find in practice that as a general thing the carriage with its appurtenances will remain.

In the grinding of screw threads on manganese steel castings it is not customary to grind the thread from the solid, though, of

Our preference is course, it can be done.

that the thread be cast and'that grinding of the thread beemployed as affix fishing step. "4

' Assume that a thread-is tofbe grdund in of the rotary motion of the work at the end 70 the doorjamb of a safe, such asillustrated in the drawings. The leader 27 is to have a pitch correspondingwith the pitch of the thread to be mind in the work. In inding the interior periphery of the threaded opening the adjustments and manner of operation wilgbe has been heretojore e the axisfofi' 'ths'whel s indle must be acter of the side of the wheel and the helical I fcharacter' of the side of the thread, but we find in practice that, notwithstanding this,

the work can be' accomplished with entire same pitch as t satisfaction.

Assuming, now, that a thread is to be ground upon the workyeither interiorly or exteriorly, the itch of leader 27 having the he thread to be ground. The wheel-housing is now to be adjusted and secured to housing at such angle that the side of the grinding wheel will coincide, as nearly as practicable, with the side of the thread to be ground, and housin 35 is to' be adjusted axially of the wor till the side of the wheel is in the plane of the side of the thread which is to be ground, allowance being madefor the depth of out which is to be taken by the wheel. The work is now to be started into rotation and axial movement, and the grinding wheel moved radially, of the work and the grinding operation upon the side of the thread is to proceed, the work changing its direction of rotation and direction of axial motion at each complete longitudinal trip of. the thread relative to the wheel, collars 24: having, of course, been properly adjusted for the reversals. 'he'wheel is to be thinner than the space between the threads, and the grinding of the thread may progressive radially of the thread, or, if

desired, the ivheel may enter the thread, it a previously ast thread is in hand, the full "depth of the bread and operate against the full depth of the side of the thread. Eventually, the root of'the space of the thread may he finished by the periphery of the wheel. a I z The grinding wheel spindle-pulley 42 might be fast upon the wheel spindle, and we have employed our machine in this manner, but by mounting the pulley in fixed bearings and connecting it with the wheel-spindle @after the manner of a universal Joint, as

illustrated, we are able to maintain the pulley in normal relationship with its driving belt notwithstanding the angular adj ust ments-of the spindle which the pulley drives.

We have heretofore spoken of the reversal of oneand a quarter rotations, the excess over a .full rotation being designed to avoid.

the possibility of a seam appearing in the grinding}, In case of a thread there should be, between reversals of rotation, an excess of rotation over that required to complete the range of the thread..- Irgother word's, if there is but one completeturn 'of the thread-there should be an excess of, say, a

quarter of a turn to avoidrpossibility' of s an excess over-such degree of rotation. The I adjustmentof collars 24 provides'for any desired degree of excess over any given complete turns of .thei'thread. v

-We ought to mention the fact that'our machine, when constructed for its intended 9 pur ose, is of very considerable size, bein I in act, a pit machine standing on a love considerably below the shop floor. The.

workman in operating the machine will generally stand on the carriage. It isfor this reason that, instead of providing a handle on. cross feed screw 49, the screw is geared to a hand wheel ona higher level.

'We have thus far given particular attention to the grindingof'threads, in which 0 1M .eration the, work moves axially. In "t a grinding of cylindrical surfaces, as hasbgn; described, the work may move axially, or, if-

desired, the nut orthe leader may be re moved and the I grinding wheel may be moved axially, by moving housing 35 of the compound rest or by movingth'e carriage.

Owing to thelack of anyinterfering endthrust due to the grinding o eration, there.

against endwisemotion during this operation. When tapersare to be ground then 'is no special necessity for Ice ing the arbor either, and the compound rest is to be swiveled to bring the axis of the wheel spindle at proper angle, and the axial movement of the grinding wheel isto be produced by the feeding movement of housing 35. onthe compound rest. In much of the grinding 12!) upon safe-parts of manganese steel, the mode of procedure followed-in. the art of roll grinding, is preferably adopted by us, especially in the initial. parts of theprocess,v

that .is' to say, the grinding wheel will be 12!} set and moved radially to complete one longitudmalportion of the surface and then moved away from the work and thenfmoved lon 'tudinally and then moved again to the wor to grind a Second portion,'and so on,

the work being ultimately completed by perwith accuracy or by longitudinally moving the wheel along the surface to be ground.

The machine particularly set forthus to be viewed merely as an exemplification of our invention. We have sought to set forth the principle of our invention and the best mode in which we at present centemplate embodying that principle.

We claim 1. A grinding Ima'chine comprising within its mechanism, an arbor provided with a chucln'bearings in which the arbor may turn and slide, grinding-wheel adapted to operate upon work held in the chuck, a screw and nut device to serve in moving the arbor endwi'se during its rotation, and mechanism for reversing the rotary motion of the arbor, combined. substantially as set forth.

A grinding machine comprising within its mechanism, an arbor provided with a chuck, hearings in which the arbor may turn and slide, a grindingwheel adapted to operate upon Work held in the chuck, a straw and nut device to serve in moving the'arbor endwise during its rotation, mechanism forrevershig the rotary motion of the arbor, and adjustable collars mounted on the arbor and adapted for the actuation of said reversing mechanism, combined substantially as set forth.

3. A grinding machine, comprising within its mechanism, an arbor provided with a chuck hearings in which the arbor may turn and slide, a grinding-wheel adapted to operate upon Work held in the chuck, a screw and nut device to serve in moving the arbor endvvise during its rotation, mechanism for re ersing the rotary motion of the arbor,

ad ustable collars mounted on the arbor and adapted for the actuation of said reversing michanism, and cams upon said collars adapted to take part in the reversing operation and permit the reversing operation to be controlled by the rotary as Well as the endwise movement of the arbor, combined substantially as set forth.

i. A grinding machine COIHPIISIIIg within its mechanism, an arbor to carry the Work to be ground, a pair of pulleys adapted to rotate said arbor and provided with clutch hubs, a clutch serving to a selected one of the pulleys into transmisslon engagement with the arbor, a lever for throwing the clutch into engagement with either pulley,

an arm adapted to move said lever, collars carried by said arbor and adapted to move said arm, and spring wedge mechanism for throwing said arm and lever to an extreme position when the arbor shall have caused the arm to pass the neutral point in its motion, combined substantially as set forth.

5. A grinding machine comprising within its mechanism, an arbor, a clutch-lever adapted by its oscillations to control the direction of motion of the arbor, a detent aperture in said clutch-lever, a detent collar adapted to enter said aperture and retain the clutchlever in neutral position, and means for adjusting saiddetent collar to active or idle position, combined substantially as set forth.

6. A grinding machine comprisin within its mechanism, a headstock, arbor-bearings carried thereby, an arbor arranged to turn and slide in said bearings, a threaded leader carried by the arbor, and a nut carried by the headstock and engaging said leader, combined substantially as set forth. 7 A grinding machine comprising within its mechanism, a hollow pulley journaled in bearings, a grinding wheel spindle mounted for rocking motion within the hollowof said pulley and provided with longitudinal grooves, and a circumferential series of balls carried by the bore of the pulley and engaging said grooves, combined substantially as set forth.

8. A grinding machine comprisin within its mechanism, a carriage, a cross sli e thereon, a compound rest swiveled in said cross slide, a grinding Wheel housing carried by said compound rest, means for adjustin said grinding wheel housing at various homzontal angles to the compound rest, a grinding wheel spindle mounted in said housing, and means for rotating said spindle, combined substantially as set forth.

MOSES MOSLER. CARL BARTELS. 

